Writing Resources
It plays an important role in reproduction hence makes what we are and our features like eye colour skin colour hair colour height etc The complete set of 23 human chromosomes is called genome This is composed of many base pairs Sometimes variation in the DNA sequence occurs When the genome is copied to make new cell a single nucleotide base pair gets deleted repeated or replaced This occurring is known as SNP Single Nucleotide Polymorphisms This alteration in the gene accounts for differences in appearance Some SNP can also lead to potential diseases condition such as Osteoporosis or an individual being affected by certain drugs Single gene disorders are inherited in recognizable patterns autosomal dominant autosomal recessive and X linked Multifactorial inheritance also known as complex or polygenic inheritance caused by combination of environmental factors and mutation in multiple genes Cystic Fibrosis and Sickle Cell Anaemia are caused when both parent pass on the gene for the disorder Huntington's diseases caused by a single dominant genes which either parent can pass on to their child As there are no such cure for these diseases however few disorders are treated with gene therapy which includes drugs nutritional supplements surgeries or combination of all Cytogenetic analyses the number and structure of human and animal chromosomes
